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TitreIndicator mineralogy of the KL-01 and KL-22 kimberlites, Lake Timiskaming kimberlite field, Ontario
TéléchargerTéléchargements
AuteurMcClenaghan, M B; Kjarsgaard, I M; Kjarsgaard, B A
SourceCommission géologique du Canada, Dossier public 5800, 2008, 47 pages; 1 CD-ROM, https://doi.org/10.4095/225398 (Accès ouvert)
LiensCanadian Database of Geochemical Surveys, downloadable files
LiensBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Année2008
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/225398
MediaCD-ROM; numérique; en ligne
Référence reliéeCette publication est reliée McClenaghan, M B; Gauvreau, D; Kjarsgaard, B A; (2009). Mineral chemistry database for kimberlite, surficial sediments and kimberlite boulders from the Lake Timiskaming and Kirkland Lake kimberlite fields, Ontario and Quebec, Commission géologique du Canada, Dossier public 5833
Liensreadme
Formatspdf (Adobe® Reader®); xls (Microsoft Excel)
ProvinceOntario
SNRC41P/08
Lat/Long OENS-80.1667 -80.0833 47.4833 47.3833
Sujetsgéochimie des eskers; eskers; kimberlites; cheminées volcaniques; roches plutoniques; roches ignées; dépôts fluvioglaciaires; sables; blocs; lithologie des galets; minéraux lourds; analyses des minéraux lourds; ilménite; chromite; grenat; pyroxene monoclinique; olivine; pérowskite; diopside; lherzolites; webstérites; pyroxénites; éclogîtes; diamant; paragenèse; péridotites; harzburgites; tills; directions du transport de la glace; transport fluvial; prospection minière; régions émettrices; Archéen; carbonates; pétrographie; pyrope; pyroxene orthorhrombique; Champ de kimberlite de Lake Timiskaming; Kimberlite de Kl-01 ; Kimberlite de Kl-02 ; géochimie; géologie des dépôts meubles/géomorphologie; géologie économique; Phanérozoïque; Cénozoïque; Quaternaire; Paléozoïque; Précambrien
Illustrationssketch maps; photographs; tables; plots
ProgrammeL'Initiative géoscientifique ciblée (IGC-1), 2000-2003
Diffusé2008 06 01; 2008 06 02
Résumé(disponible en anglais seulement)
Kimberlite and till samples from the recently discovered KL-01 and KL-22 kimberlites in the Lake Timiskaming kimberlite field, northeastern Ontario, have been studied by the Geological Survey of Canada to determine their kimberlite indicator mineral signatures. These new results compliment earlier work published on the Lake Timiskaming kimberlites by the GSC. The KL-01 kimberlite is covered by only 1 to 4 m of till and thus is deeply weathered. The KL-22 kimberlite is covered by more than 10 m of glacial sediments and thus is fresh at its subcropping surface. Both kimberlites contain thousands of indicator minerals per 10 kg in the 0.25 to 0.5 mm fraction. The kimberlites, however, are characterized by different relative abundance of indicator mineral species. The 0.25 to 2.0 mm fraction of the KL-22 kimberlite is dominated by chromite, with lesser amounts of Cr-pyrope and Cr-diopside, very few Mg-ilmenite, scarce eclogitic garnets, and no olivine. The 0.25 to 2.0 mm fraction of the KL-01 kimberlite is dominated by Cr-pyrope, with lesser amounts of chromite, Mg-ilmenite and Cr-diospide, scarce eclogitic garnets, and no olivine. Till overlying the KL-22 kimberlite contains only a few tens of indicator mineral grains and does not contain much garnet, a relatively abundant indicator mineral in the KL-22 kimberlite. Thus this till likely reflects background concentrations in the area rather than incorporation of KL-22 kimberlite debris. Indicator mineral populations of the KL-01 and KL-22 kimberlites are dominated by chromite, Crpyrope, and Cr-diopside from fertile garnet lherzolite. Subcalcic garnets are abundant as well but they are only marginally Cr-rich with respect to diamond potential and magnesiochromites include some diamond inclusion and diamond intergrowth field. Garnet megacrysts are rare in both kimberlites, as are orange diamond sub-class eclogite garnets. Similar mineral compositions and age dates for the two kimberlites strongly suggest that KL-01 and KL-22 are genetically related.
GEOSCAN ID225398